390 PHARMACEUTICAL BOTANY 
hypha is composed of a vertical septate branch of the mycelium 
called the conidiophore, branches of this, which are called secondary 
conidiophores, and chains of spores at the tips of sterzgmata (cells 
al 
Fic. 290.—Penicillium Camemberti. a, Conidiophore with common type of 
branching with conidiospores; (6) a common less-branched form; ¢, d, f, diagrams 
of large fructifications; g, i, j, germinating conidiospores. (From Bull. 82, Bureau 
of Animal Industry, also after Thom.) 
bearing conidia) which are called conidia or conidiospores. ‘The 
conidia form the loose green powder characteristic of Penicillium. 
A number of species of Penicillium are useful in the arts. 
Penicillium roqueforti is the principal ripening agent of Roquefort, 
Gorgonzola and Stilton cheeses. It possesses blue-green globu- 
lar conidia 4 to 5u in diameter. 
